Working ten hour days allows you to fall behind twice as fast as you could working five hour days.

All the hundreds of millions of people who, in their time, believed the Earth was flat never succeeded in unrounding it by an inch.

It is change continuing change, inevitable change that is the dominant factor in society today.

I wanted to be a psychological engineer, but we lacked the facilities, so I did the next best thing - I went into politics. It's practically the same thing.

All roads lead to Trantor, says the old proverb, and that is where all stars end.

Boasts are wind and deeds are hard.

Knowledge is indivisible. When people grow wise in one direction, they are sure to make it easier for themselves to grow wise in other directions as well. On the other hand, when they split up knowledge, concentrate on their own field, and scorn and ignore other fields, they grow less wise - even in their own field.